Poor Idle Speed Performance; Poor Medium And High Speed Performance; Poor Speed Performance - Coleman POWERSPORTS AT125-B Manual

POOR IDLE SPEED PERFORMANCE

Carburetor
·Loose or clogged pilot jet
·Damaged carburetor joint
·Improperly tightened carburetor
·Joint clamp hose
·Improperly adjusted idle speed
(Pilot screw), (Throttle stop screw)
·Improperly adjusted throttle cable
·Flooded carburetor

POOR MEDIUM AND HIGH SPEED PERFORMANCE

Carburetor
·Improperly adjusted fuel level
·Clogged main nozzle
·Clogged or loose pilot jet

POOR SPEED PERFORMANCE

Ignition system
·Dirty spark plug
·Improper heat range
·Faulty igniter unit
·Faulty pick up coil
Fuel system
·Clogged fuel tank breather hole
·Clogged air cleaner element
·Clogged jet
·Improperly adjusted fuel level
·Improper carburetor air vent hose
setting
Air cleaner
·Clogged air cleaner element
Ignition system
·Fault spark plug
·Fault high tension cord
·Fault igniter unit
·Fault pick up coil
·Fault ignition coil
Valve system
·Improperly adjusted
·Valve clearance
Air cleaner
·Clogged air cleaner element
Compression system
·Worn cylinder
·Worn or seized piston ring
·Cylinder head gasket broken
·Cylinder gasket broken
·Carbon deposit build up
·Improperly adjusted valve
clearance
·Improperly contacted
valve and valve seat
·Faulty valve timing
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